I was trying to write a code to handle exceptions, but overriding another exception handler, is it possible? I was developing an exe in asm to debug a dll, and detect some exceptions that are raised (access violation) but the dll has its own exception handling, so a normal SEH should not work, i would like to know if there is any kind o...
Im currently trying to write a disassembler. I found the following list of opcodes and their meanings, so i decided to parse it at runtime: http://mprolab.teipir.gr/vivlio80X86/pentium.txt But i am stuck at the opcode 0x00: It is followed by a reg/modbyte. Parsing it was not much of a problem for me. But i'm having trouble with the Scal...
Dear all, Lets say that my GPU includes a chip called ADT7473. I am interested in receiving information from this chip about the temperature of my card. My question is, how to access this chip? is that accomplished using the IN/OUT instructions? EDIT: I might add those lines found in the chip's documentation : Table 18. Temperatu...
I m developing a bootloader for which i have a bin file whose assembly is somewhat like this.. -u 0 200 141A:0000 CD20 INT 20 141A:0002 FF9F009A CALL FAR [BX+9A00] 141A:0006 EE OUT DX,AL 141A:0007 FE1D CALL FAR [...
What's mean lea 0x4(%esp),%ecx in at&t assembly? What really is 0x4(%esp)? ...
My code is simple as below.I found rmb and wmb for read and write,but found no general one.lwsync is available on PowerPC,but what is the replacement for x86?Thanks in advance. #define barrier() __asm__ volatile ("lwsync") ... lock() if(!pInst); { T* temp=new T; barrier(); pInst=temp; } unlock...
My client asked me to write an custom encrypted executable to prevent easy cracking of the licensing system. Now, I understand that this is a false sense of security, but despite this he insisted on it. So, I dug up my knowledge of portable executables and came up with this idea: Encrypt the executable Stick this to the end of a loa...
Hello, I am writing small kernel for the 8086 processor (Working in BC3.1, on Windows XP as host operating system). Kernel is multithreaded, so I have problems when I use printf or cout for debugging (somewhere in code, printf sets InterruptEnable flag to 1, and my timer interrupt routine calls dispatch and my code breaks down). Becaus...
disclaimer : I'm an asm newbie. I probably need to review my 2s complement or something to fully comprehend :( I'm confused as to the purpose of the following: .... BL some_func MOV R3, R0,LSL#16 MOVS R3, R3,LSR#16 .... why the shift back? and the movs? ...
Hi, I must patch an arm executable in my Pocket PC. I am dissassembling the ARM executable with IDA Pro. But I can not edit binary. As you know Ollydbg let us to edit binary / add assembly code (Right Click->Assemble) But it doesnt support ARM. So I dissassembly it with IDA Pro. But in IDA , I can not add my assembly code into my ARM E...
I am trying to learn assembly language and I need clarification on something. Please correct me if I am wrong on any of this since I don't know much about assembly. All the tutorials I watch have the variables of assembly programs assigned to a memory address like 0x0000, and I can understand that you must manually assign memory addres...
Should I start learning 8086 assembly language by learning assembly language of a processor with a reduced instruction set like one of PIC family? ...
Hi, I am learning assembly language. Is there modulus operator in assembly? I know I can find the remainder using the formula Number= Divident * Divisor + Remainder. I have heard when we use the DIV syntax the remainder is stored in one of the register? Edit 1 : I am using Intel x86 Architecture and devloping it on Ubuntu. Thanks....
Hi, I am new to assembly language. I have written a program for taking an input and then displaying whether the number is prime or not. Here is my source code. .intel_syntax noprefix .include "console.i" .data Num: .long 0 .text ask: .asciz "Enter a +ve number : " ansp: .asciz " is prime." ...
i mean...nop is 90, push is 55 ...the others?any link?i google it but nothing came out... ...
Hello In linux kernel in the implementation of spinlocks, e.g. http://lxr.linux.no/#linux+v2.6.18/include/asm-i386/semaphore.h#L97 97static inline void down(struct semaphore * sem) 98{ 99 might_sleep(); 100 __asm__ __volatile__( 101 "# atomic down operation\n\t" 102 LOCK_PREFIX "decl...
I am reading the book "Professional Assembly Language", with sample code written for Intel IA-32 processors. Assembler used is GNU Assembler. Where can I find this Assembly reference? For example, writing Assembly for Windows, I can find the reference in Intel WEB site. What about Linux and GNU Assembler? ...
I start university in a few weeks (software engineering degree) and know that one of the modules I'll be studying in the first year is 'fundamentals of architecture' or something similar; basically it's learning to program in 'assembly'. I'm wanting to do some background learning so I'm prepared for it (I've done the same on some other ...
I always wanted to learn 8086 assembly but was (and am) a little confused on where to start. We are learning PIC16F690 at the moment in school and I'm good at it. So I guess I can give 8086 a try. I'm wondering is there an IDE for 8086 like MPLAB IDE where in it you can write code and execute instructions line by line and watch memory, r...
Hello, I am using Inline asm in C++/CLI. Horrible problem infact could be a bug I obsereved. I passed vector from one function call to another. If I comment the whole code snippet of _asm{....some assembly code here} inside the called function where vector used which are provided to it from other function, then no problem whole vector...